Battery Charging Current Analysis for Zero-Current Fault Signs

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Solution Overview

Problem

Existing methods for detecting instant short-circuits in lithium ion batteries due to metal deposition are inaccurate and costly due to the rapid voltage changes, requiring high-speed sampling and expensive equipment.

Innovation Solution

A sign detection system that monitors current data during battery charging, identifying a zero-current section as a sign of an unusable battery pack, using existing equipment to detect frequent zero-current sections, energy loss, and temperature changes to distinguish between normal and abnormal conditions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If high-speed sampling is used to monitor voltage changes accurately, then detection accuracy is improved, but cost and power consumption increase

Engineering Contradiction:

Improvevoltage change detection accuracyVSAvoidmeasurement system specifications

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent replaces the mechanical/electrical measurement system (voltage sampling hardware) with a data analysis system that processes existing charging data. Instead of using high-speed voltage sampling equipment, the system analyzes patterns in normal charging data to detect abnormalities, thereby avoiding the need for expensive high-specification measurement devices while maintaining detection accuracy

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent creates a virtual model of normal charging behavior by collecting and analyzing historical charging data. This digital copy or model of normal charging patterns is then used to detect deviations that indicate battery abnormalities, replacing the need for complex real-time voltage monitoring hardware

Inventive Principle:

Principle #26Copying

2Measurement precision

If voltage monitoring with high-speed sampling is implemented, then detection accuracy is improved, but power consumption increases

Engineering Contradiction:

Improvevoltage change detection accuracyVSAvoidpower consumption

Core Design Contradiction:

Measurement precisionVSUse of energy by moving object

Solution Approach 1:

The patent substitutes high-power voltage sampling hardware with low-power data processing software. By analyzing patterns in existing charging data rather than continuously sampling voltage at high speed, the system achieves comparable detection accuracy with significantly reduced power consumption

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent performs preliminary data collection and pattern learning during normal charging operations. By pre-processing and storing charging data for later analysis, the system avoids the need for continuous high-speed sampling during critical detection phases, thereby reducing overall power consumption

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentEP4376164B1Sign detection system, sign detection method, and sign detection program

Publication Date: 2026.01.28 PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD

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AI summary

In a sign detection system, a battery data acquisition unit acquires battery data including current data obtained by periodically measuring a current flowing through a battery pack. When the current data in a period of charging the battery pack by a charger include a section temporarily having a current value of zero, a determination unit determines that the occurrence of the section having the current value of zero is a sign of unavailability of the battery pack.